Iphone 帮助我使用JSONTouch解析JSON值

我有以下json：

我想通过下面的代码获取此数据中的所有名称，但它给出了一个错误。我怎样才能修好它

NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];


 NSDictionary *results = [responseString JSONValue];

 NSDictionary *users = [results objectForKey:@"users"] objectForKey:@"user"];


 for (NSDictionary *user in users){
  //NSLog(@"key:%@, value:%@", user, [user objectForKey:user]);
  NSString *title = [users objectForKey:@"NAME"];
  NSLog(@"%@", title);
 }

错误：

2011-01-29 00:18:50.386 NeighborMe[7763:207] -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0xb618840
2011-01-29 00:18:50.388 NeighborMe[7763:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0xb618840'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x027d9b99 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x0292940e objc_exception_throw + 47
    2   CoreFoundation                      0x027db6ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x0274b2b6 ___forwarding___ + 966
    4   CoreFoundation                      0x0274ae72 _CF_forwarding_prep_0 + 50
    5   NeighborMe                          0x0000bd75 -[NeighborListViewController connectionDidFinishLoading:] + 226
    6   Foundation                          0x0007cb96 -[NSURLConnection(NSURLConnectionReallyInternal) sendDidFinishLoading] + 108
    7   Foundation                          0x0007caef _NSURLConnectionDidFinishLoading + 133
    8   CFNetwork                           0x02d8d72f _ZN19URLConnectionClient23_clientDidFinishLoadingEPNS_26ClientConnectionEventQueueE + 285
    9   CFNetwork                           0x02e58fcf _ZN19URLConnectionClient26ClientConnectionEventQueue33processAllEventsAndConsumePayloadEP20XConnectionEventInfoI12XClientEvent18XClientEventParamsEl + 389
    10  CFNetwork                           0x02e5944b _ZN19URLConnectionClient26ClientConnectionEventQueue33processAllEventsAndConsumePayloadEP20XConnectionEventInfoI12XClientEvent18XClientEventParamsEl + 1537
    11  CFNetwork                           0x02d82968 _ZN19URLConnectionClient13processEventsEv + 100
    12  CFNetwork                           0x02d827e5 _ZN17MultiplexerSource7performEv + 251
    13  CoreFoundation                      0x027bafaf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    14  CoreFoundation                      0x0271939b __CFRunLoopDoSources0 + 571
    15  CoreFoundation                      0x02718896 __CFRunLoopRun + 470
    16  CoreFoundation                      0x02718350 CFRunLoopRunSpecific + 208
    17  CoreFoundation                      0x02718271 CFRunLoopRunInMode + 97
    18  GraphicsServices                    0x030b800c GSEventRunModal + 217
    19  GraphicsServices                    0x030b80d1 GSEventRun + 115
    20  UIKit                               0x002e9af2 UIApplicationMain + 1160
    21  NeighborMe                          0x00001c34 main + 102
    22  NeighborMe                          0x00001bc5 start + 53
    23  ???                                 0x00000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'

---

我真的只是想能够遍历名称

在我看来，当你创建“用户”词典时，你实际上是在创建“用户”词典

 NSDictionary *users = [[results objectForKey:@"users"] objectForKey:@"user"];//crating users dictionary with 1 "user" inside.

编辑

第二种观点。为什么不迭代“结果”字典呢？ 那样-

 for (NSDictionary *user in result){
  //NSLog(@"key:%@, value:%@", user, [user objectForKey:user]);
  NSString *title = [users objectForKey:@"NAME"];
  NSLog(@"%@", title);
 }

希望能有所帮助

---

shani

在我看来，当你创建“用户”词典时，你实际上是在创建“用户”词典

 NSDictionary *users = [[results objectForKey:@"users"] objectForKey:@"user"];//crating users dictionary with 1 "user" inside.

编辑

第二种观点。为什么不迭代“结果”字典呢？ 那样-

 for (NSDictionary *user in result){
  //NSLog(@"key:%@, value:%@", user, [user objectForKey:user]);
  NSString *title = [users objectForKey:@"NAME"];
  NSLog(@"%@", title);
 }

希望能有所帮助 沙尼

JSON数据的顶级值是一个数组。它不是JSON对象，因此它不是字典。这就是为什么将

-[\uu NSArrayM objectForKey:]：无法识别的选择器发送到实例
异常的原因

JSON数据中没有“用户”条目

上面的代码无法编译

---

第一步是理解JSON数据。其结构如下：

顶级值是一个数组

数组中的每个元素都是一个对象/字典，具有一个名为“user”的键

“用户”键的值本身就是另一个具有各种键值对的对象/字典

如果您想迭代用户并打印“NAME”键的值，请遵循下面的示例

NSString *responseString = [[NSString alloc] initWithData:responseData
    encoding:NSUTF8StringEncoding];

// 1. the top level value is an array
NSArray *results = [responseString JSONValue];

// 2. each element in the array is an object/dictionary with
// a single key called "user"
for (NSDictionary *element in results) {
    // 3. the value of the "user" key is itself another object/dictionary
    // with various key-value pairs
    NSDictionary *user = [element objectForKey:@"user"];
    NSString *title = [user objectForKey:@"NAME"];
    NSLog(@"%@", title);
}

JSON数据的顶级值是一个数组。它不是JSON对象，因此它不是字典。这就是为什么将

-[\uu NSArrayM objectForKey:]：无法识别的选择器发送到实例
异常的原因

JSON数据中没有“用户”条目

上面的代码无法编译

---

第一步是理解JSON数据。其结构如下：

顶级值是一个数组

数组中的每个元素都是一个对象/字典，具有一个名为“user”的键

“用户”键的值本身就是另一个具有各种键值对的对象/字典

如果您想迭代用户并打印“NAME”键的值，请遵循下面的示例

NSString *responseString = [[NSString alloc] initWithData:responseData
    encoding:NSUTF8StringEncoding];

// 1. the top level value is an array
NSArray *results = [responseString JSONValue];

// 2. each element in the array is an object/dictionary with
// a single key called "user"
for (NSDictionary *element in results) {
    // 3. the value of the "user" key is itself another object/dictionary
    // with various key-value pairs
    NSDictionary *user = [element objectForKey:@"user"];
    NSString *title = [user objectForKey:@"NAME"];
    NSLog(@"%@", title);
}

---

您的答案与OP使用的JSON数据不匹配。您的答案与OP使用的JSON数据不匹配。